Syringe.



JOHN H. SHEETS, OF NEW YORK, N. Y.

asaesr.

Specification of Letters Patent.

SYRINGE.

Patented Feb. ME, 1911.

Application tiled May 1l, 1909. Serial No. 495,250.

To all whom it may concern:

Be it known that I, Joux ll. Srrnn'rs, a citizen of the United States,and a resident of the city of New York, borough of Manhattan, in thecounty and State of New York, have invented a new and Improved Syringe,of which the following is a full, clear, and exact description.

The invention relates to syringes of the barrel and piston type, such,for instance, as shown and described in the Letters Fatent of the UnitedStates, No. 730,054, granted to me on June 2, 1903.

The object'of the present invention is to provide a new and improvedsyringe, which is simple in construction, composed of comparatively fewparts, and arranged to form a container for safely carrying a largequantity of liquid, to be ejected periodically in small doses asrequired. For the purpose mentioned the hollow piston rod of the pistonis provided with a port controlled by a valve, having its stem extendingthrough the hollow piston rod to the out-v side, to allow the user ofthe syringe to shiftthe valve relative to the port, so that the liquidcan be readily drawn into the barrel to till the same. The liquid can betransferred in the barrel from the front or suction end to the rear ofthe barrel, and a measured portion of the liquid can be trans ferredfrom the rear of the barrel to the front thereof, to be forcibly ejectedthrough the nozzle.

A practical embodiment of the invention is represented in theaccompanying drawy ings forming a part of this specification, in

which similar characters of reference indicate corresponding parts inall the views.

Figure l is an enlarged sectional side elevation of the improvement,showing the parts in position when filling the barrel with a liquid;Fig. 2 is a transverse section of the same, on the line Q-Q in Fig. lshow ing the parts in position for transferring a portion of the liquidfrom the rear of the barrel to the front end thereof; Fig. 3 is asimilar view of the same, showing the parts in position for ejecting thedose through the nozzle to the atllicted part; and Fig. 4lis a sideelevation, partly in section, of one of the interchangeable nozzles tobe used on the barrel.

The barrel A, of glass or other suitable material, is preferablyscrew-threaded at both ends, and on the forward end screws aninterchai'igeable nozzle B, of any approved construction, and the rearend of the barrel A is closed by head C. In the barrel A is mounted toreciprocate a piston D, provided with a hollow piston rod D, extendingthrough the head C and terminating at its outer end in a handle E,adapted to be taken hold of by the user of the syringe, for moving thepiston D forward or backward in the barrel A.

rlhe hollow piston rod D is provided, adjacent to the rear face of thepiston D, with a port a, leading to the bore of the hollow piston rod Dand opening into the rear end of the barrel A, so as to establishcommunication between the front and rear ends of the barrel, and also toconnect the rear end of the barrel A with the atmosphere for ventpurposes, as hereinafter more fully explained. rlhe port a is controlledby a valve F, preferably in the form of a disk mounted to slide in thebore of the hollow piston rod D, and the stem F of the valve F extendsrearwardly throughV the hollow piston rod D and terminates at its rearend in an angular handle F2, passing through a bayonet slot 4E formed inthe shank of the piston rod handle E. The valve stem F, between thevalve F and the handle F2, is preferably covered by a tubular lining Gr,of rubber or other suitable material, the stem F being preferably ofmetal and the valve F being preferably of leather', rubber or othersuitable material. lVhen the handle F2 of the valve F is in the outerend of the slot E, then the valve F uncovers the port a, as shown inFig. Q, to establish communication between the front and rear ends ofthe barrel A by way of the front end of the bore of the piston rod D andthe port a. Then y the handle F2 is moved to the inner end of the slotFK, then the valve F is in front of the port a (see Figs. l and 3), sothat com munication is established between the rear end of the barrel Aand the atmosphere, by way 4of the port a, the rear portion of the boreof the piston rod D and the slotvE. When the handle F2 is moved into anintermediate position, approximately midway between the ends of the slotE. then the valve F closes the port a, thus disconnecting the front andrear ends of the barrel from each other, and also disconnecting the rearend of the barrel from the atmosphere.

Then itis desired to fill the barrel A with the liquid or other fluid,then the 0perator moves the piston D to the front end of the barrel A,and shifts the valve F forward past the port a to the position shown inFigs. l and 3. The nozzle B is now immersed in the liquid, and thepiston D is drawn rearward, so that the liquid is drawn into the frontend of the barrel A, to fill the same, while the air in the rear end ofthe piston can escape through the port L and the bore of the piston rodD and slot E, as previously explained. Aft er the barrel Ak is filled,Jthe syringe is turned upside down, as shown in Fig. Q, and then theoperator pushes the handle F2 to the rear end of the slot E, so that thevalve F moves to the rear of the port a. The operator now pushes thepiston D forward in the barrel A, so that the liquid contained in thefront end of the barrel A flows to the rear end thereof by way of theport a and the front end of the bore of the piston rod D. lVhen theliquid has been transferred from the front end of the barrel to the rearend thereof, then the operator moves the handle F2 to an intermediateposition for the valve F to close the port (t. The liquid is nowentrapped in the rear of the barrel A, and the syringe containing theliquid can be safely carried about in a pocket without danger of theliquid accidentally passing out of the barrel.

W'hen it is desired to eject a measured quantity of the liquid to anatl'licted part, the operator moves the handle F 2 to the rear end ofthe slot E. so as to uncover the port a, the syringe being held in theupside down position, as shown in Fig. 2. Now by drawing' the piston Drearward in the barrel A, the portion of the liquid in the rear end ofthe barrel is transferred to the front end thereof, and when the desiredamount of liquid has been transferred the operator moves the handle F2forward to the front end of the slot E, so that the valve F passesbeyond the port a. Now when the operator pushes the handle E forward,the piston D ejects the measured quantity in the front end of the barrelA through the nozzle B to the afliicted part, and air is free to passinto the rear end of the barrel A by way of the slot E, the bore of thepiston rod D and the port a, as will be readily understood by referenceto Fig. 3. After the liquid is ejected, the operator returns the handleF2 to an intermediate position, so that the4 valve F closes the port a.

From the foregoing it will be seen that by the arrangement described, adesired amount of liquid in the rear end of the barrel can betransferred to the front end of the barrel, to be ejected, and thisoperation can be repeated as long as the barrel contains the liquid.

The syringe shown and described is very simple in construction, composedof con paratively few parts, not liable easily to get out of order.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

l. A syringe, comprising a barrel, a piston movable therein and having ahollow piston rod provided with a port opening into the barrel at therear of the piston, and a manually-controlled valve movable in the saidpiston rod and controlling the said port, the stem of the said valveextending through the said hollow piston rod to the outside thereof formanipulation by the user of the syringe.

2. A syringe, comprising a barrel. a piston movable therein and having a'hollow` piston rod provided with a port opening into the barrel at therear of the piston, and a manually-controlled valve .movable in the saidpiston rod and controlling the said port, the said valve having its steme);` tending' through the hollow piston rod, the outer end of the valvestem having-a handle.'

3. A syringe, comprising a barrel, a piston movable therein and having ahollow piston rod provided with a port opening into the barrel at therear of the piston, the forward portion of the said hollow piston rodand the port forming a connection for the passage of the liquid from thefront end of the barrel to the rear end thereof and vice versa, and therear portion of the said hollow piston rod formingwith the said port avent for the escape and entrance of the air from and to the rear end ofthe barrel, and a manually-controlled valve controlling the said port,the said valve hav-V ing a body and a valve stem within the hollowpiston rod, the said body being adapted to move to either side of thesaid port or to close the saine, and the said valve stem having itsouter end provided with a handle extending in a bayonet slot formed inthe outer' end of the piston rod.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN H. SHEETS. lVitnesses Trino. Gr. Hoeren, JOHN l). Davis,

